lab (n.)youdaoicibaDictYouDict[lab 词源字典]
shortened form of laboratory, 1895.[lab etymology, lab origin, 英语词源]
labefaction (n.)youdaoicibaDictYouDict
1610s, "process of shaking; downfall," noun of action from Latin labefactus, past participle of labefacere "to cause to totter, shake; overthrow," from labi "to slip, slide" (see lapse (n.)) + facere "to make, do" (see factitious). Related: Labefy.
label (n.)youdaoicibaDictYouDict
c. 1300, "narrow band or strip of cloth" (oldest use is as a technical term in heraldry), from Old French label, lambel "ribbon, fringe worn on clothes" (13c., Modern French lambeau "strip, rag, shred, tatter"), possibly from Frankish *labba or some other Germanic source (compare Old High German lappa "flap"), from Proto-Germanic *lapp- (see lap (n.)).

Later "dangling strip of cloth or ribbon used as an ornament in dress," "strip attached to a document to hold a seal" (both early 15c.), and with a general meaning "tag, sticker, slip of paper" (1670s). Meaning "circular piece of paper in the center of a gramophone record" (1907), containing information about the recorded music, led to meaning "a recording company" (1947).
label (v.)youdaoicibaDictYouDict
"to affix a label to," c. 1600, see label (n.); figurative sense of "to categorize" is from 1853. Related: Labeled; labeling; labelled; labelling.
labia (n.)youdaoicibaDictYouDict
from Latin labia, plural of labium "lip" (see lip (n.)). Specifically of the folds on either side of the vulva from 1630s (labia pudendi).
labia majora (n.)youdaoicibaDictYouDict
the outer fold of skin around the vulva, 1813, Modern Latin, literally "great lips" (see labia). The singular is labium majus.
labia minora (n.)youdaoicibaDictYouDict
inner folds of skin around the vulva, 1781, Modern Latin, literally "lesser lips" (see labia). The singular is labium minus.
labial (adj.)youdaoicibaDictYouDict
"pertaining to the lips," 1590s, from Medieval Latin labialis "having to do with the lips," from Latin labium "lip" (see lip (n.)). The noun meaning “a labial sound” is from 1660s. Related: Labially.
labiate (adj.)youdaoicibaDictYouDict
"having a lip or lip-like part," 1706, from Modern Latin labiatus "lipped," from Latin labium "lip" (see lip (n.)).
labio-youdaoicibaDictYouDict
word-forming element in medical use, taken as a comb. form of Latin labium "lip" (see lip (n.)).
labium (n.)youdaoicibaDictYouDict
1590s, plural labia, from Latin labium "lip" (see lip (n.)).
labonza (n.)youdaoicibaDictYouDict
"belly," 1943, American English slang, probably from dialectal pronunciation of Italian la pancia "the belly," from Latin pantex (genitive panticis) "belly" (see paunch).
labor (n.)youdaoicibaDictYouDict
c. 1300, "a task, a project;" later "exertion of the body; trouble, difficulty, hardship" (late 14c.), from Old French labor "labor, toil, work, exertion, task" (12c., Modern French labeur), from Latin laborem (nominative labor) "labor, toil, exertion; hardship, pain, fatigue; a work, a product of labor," of uncertain origin, perhaps originally from the notion of "tottering under a burden," and related to labere "to totter."

Meaning "body of laborers considered as a class" (usually contrasted to capitalists) is from 1839. Sense of "physical exertions of childbirth" is 1590s, earlier labour of birthe (early 15c.), a sense also found in Old French, and compare French en travail "in (childbirth) suffering" (see travail). Labor Day first marked 1882 in New York City.
labor (v.)youdaoicibaDictYouDict
late 14c., "perform manual or physical work; work hard; keep busy; take pains, strive, endeavor" (also "copulate"), from Old French laborer "work, toil; struggle, have difficulty," from Latin laborare, from labor (see labor (n.)). The verb in modern French, Spanish, Portuguese means "to plow;" the wider sense being taken by the equivalent of English travail. Sense of "to endure pain, suffer" is early 15c., especially in phrase labor of child. Related: Labored; laboring.
laboratory (n.)youdaoicibaDictYouDict
c. 1600, "building set apart for scientific experiments," from Medieval Latin laboratorium "a place for labor or work," from Latin laboratus, past participle of laborare "to work" (see labor (n.)). Figurative use by 1660s.
labored (adj.)youdaoicibaDictYouDict
also laboured, "learned," mid-15c., past participle adjective from labor (v.). Meaning "done with much labor" is from c. 1600.
laborer (n.)youdaoicibaDictYouDict
mid-14c., "manual worker," especially an unskilled one, agent noun from labor (v.). Meaning "member of the working class, member of the lowest social rank" is from c. 1400.
laborious (adj.)youdaoicibaDictYouDict
late 14c., "hard-working, industrious," from Old French laborios "arduous, wearisome; hard-working" (12c., Modern French laborieux), from Latin laboriosus "toilsome, wearisome, troublesome," from labor (see labor (n.)). Meaning "costing much labor, burdensome" is from early 15c.; meaning "resulting from hard work" is mid-15c. Related: Laboriousness.
laboriously (adv.)youdaoicibaDictYouDict
early 15c., "with difficulty, laboriously, slowly," from laborious + -ly (2). Meaning "earnestly, strongly" is from c. 1500.
labouryoudaoicibaDictYouDict
chiefly British English spelling of labor (q.v.); for spelling, see -or. As short for "the British Labour Party" it is from 1906.